It is unlawful and a public nuisance for any responsible persons to knowingly host, permit, or allow an underage or unruly gathering to occur at private property in the city concerning which the responsible person has a right of possession specified in Section 10.64.030(F) where at least one underage person consumes an alcoholic beverage. For purposes of this chapter, a responsible person knowingly hosts, permits or allows an underage or unruly gathering where at least one underage person consumes an alcoholic beverage whenever the responsible person is aware an underage person has consumed an alcoholic beverage at an underage or unruly gathering or reasonably should have been aware an underage person has consumed an alcoholic beverage at such a gathering had the responsible person taken all reasonable steps to prevent consumption of alcoholic beverages by underage persons in accordance with Section 10.64.040. Violation of this section by any responsible person is subject to the criminal, civil and/or administrative penalties set forth in this chapter in addition to recovery of response costs in accordance with Section 10.64.110, and any other applicable penalties under applicable law. It shall be prima facie evidence that the responsible person knew or should have known of both the underage or unruly gathering and the consumption of alcoholic beverages by underage persons at the gathering if the responsible person is present on the property at any point during the gathering. To the full extent permitted by law, owners of properties as defined in Section 10.64.030(F)(1) shall remain responsible persons liable for violations of this chapter on such property regardless of any contract or agreement regarding the property that purports to provide otherwise. (Ord. 2257 NCS §1 (part), 2006.)